Wound bobbin



C. F. DE LON WOUND BOBBIN Filed Dec. 9, 19

MZN N 0 TTO 5Y5.

Patented July 17, 1934 FFHQE WOUND BOBBIN Charles Frederick De Long,Mount Vernon, N. Y., assignor to The Clark Thread Company, Newark, N.J., a corporation of New Jersey Application December 9, 1932, Serial No.646,401

Claims.

This application relates to a new and useful improvement in woundbobbin, the novel features of which will be best understood from thefollowing description and the annexed drawing, in

5 which I have shown a selected embodiment of the invention and inwhich:

Fig. 1 is a vertical sectional view through a bob bin constructedaccording to my invention.

Fig. 2 is an enlarged view similar to Fig. 1, but

showing a different embodiment of the invention.

Fig. 3 is a bottom or top plan view of the bobbin appearing in Fig. 1.

Fig. 4 is an exploded view of the same bobbin.

The bobbin shown in Figs. 1, 3, and 4 comprises a core 1 which may bemade of a short section of paper tubing, as is common in the art, and onthis core is wound a mass 2 of thread, this mass being of the usualgenerally cylindrical form indicated. While this form may vary somewhat,it will, for the sake of convenience, be referred to as a cylindricalmass, and the ends of the mass are disposed in planes generallyperpendicular to the axis of the core 1.

Bobbins of this type are sometimes mounted on spindles, either in or outof a casing, and the thread unwound, the bobbin rotating freely on thespindle, whereas in many instances the bob bin is merely placed within acasing from which it may be withdrawn. In Fig. 1, I have indicated bydot and dash lines a spindle 3 projecting upwardly from a horizontalsurface 4, which may be the bottom of a casing containing the bobbin. Itis often the case that a bobbin will unwind too rapidly, this beingcaused by the ease of rotation thereof which, in turn, causes the bobbinto continue rotating after the pull of the thread has ceased. In orderto avoid this result, I have devised a means of retarding the movementof the bobbin by imposing a frictional drag thereon, in which I believeto be a novel manner. One construction which may be used to achieve thisresult is shown in the drawing and consists of disks 5 placed at eitherend of the core 1 and centered therein by means of centers 6 extendingwithin the core for a short distance. Disposed adjacent the edge '7 ofthe wound mass of thread is a rim 8 preferably relatively narrow andconnected to the center 6 by means of narrow spokes 9.

The mass of thread is first wound upon the core and then the disksforming the ends of the bobbin are preferably pressed into closeengagement with the core and the mass. This pressure is usually providedby the use of flat dies, and ordinarily is sufficient to cause the massto enter the openings 10 between the spokes and come into contact withthe dies. Then the expansion of the thread mass at these openings willcause it to project outwardly beyond the outer surfaces of the disks, asindicated at 11 in Fig. 1. The disks may be made of metal or any othersuitable material, and usually will form a comparatively smallresistance to the rotation of the bobbin, whereas the thread projectingthrough the openings 10 provide a comparatively roughened surfaceoffering a greater frictional drag than the material of the disks. Therim 8 will aid in the proper unwinding of the thread from the bobbin.

In Fig. 2 is shown a different embodiment of the invention, in thisinstance there being provided a sheet 12 of thin flexible material suchas that sold under the name of Cellophane. This sheet may be perforatedto receive the core 1, and is preferably of sufficient area to cover allthe openings 10 in the adjacent end disk. When the disks are pressedinto engagement with the thread mass and then that mass ex pands, thesheet will contact with the surface 4, as shown at 11, therebyprotecting the thread from wear as the bobbin rotates. Of course it isunderstood that sheets 12 will normally be used with both of the enddisks 5.

While I have shown the invention as embodied in a specific form, it isto be understood that various changes in details may be made withoutdeparting from the scope of the invention, and 35 I therefore do notintend to limit myself except by the appended claims.

I claim:

1. A Wound bobbin comprising a core having thread wound thereon to forma thread mass of cylindrical form, and a disk mounted on one end of saidcore and extending across one end of said cylindrical mass, said diskhaving openings therein through which said mass projects.

2. A wound bobbin comprising a core having thread wound thereon to forma thread mass of cylindrical form, and an end on said core extendingacross and pressed into tight engagement with one end of saidcylindrical mass, said end having a narrow rim adjacent the edge of saidmass and having openings therein through which the major portion of saidend of the mass project.

3. A wound bobbin comprising a core having thread wound thereon toform athread mass of cylindrical form, and a disk mounted on one end of saidcore and extending across one end of said cylindrical mass, said diskhaving openings therein and being pressed into tight en- 310 gagementwith said mass to cause said mass to project into said openings.

4. A wound bobbin comprising a core having thread wound thereon to forma thread mass of cylindrical form, a narrow rim disposed on one end ofsaid cylindrical mass adjacent the edge thereof, a center disposedwithin one end of said core, and spokes connecting said center to saidrim, whereby the mass end may project between said spokes after they arepressed into contact therewith.

5. A wound bobbin comprising a core having thread wound thereon to forma thread mass of cylindrical form, a disk mounted on one end of saidcore and extending across one end of said cylindrical mass, and a sheetof thin flexible material disposed between said disk and the end of themass, said disk having openings therein through which parts of saidsheet project.

CHARLES FREDERICK DE LONG.

